Intermediates and methods of preparation of intermediates in the enantiomeric synthesis of (20R)homocamptothecins and the enantiomeric synthesis of (20R)homocamptothecins
申请人:——
公开号:US20030073840A1
公开(公告)日:2003-04-17
A method of synthesizing a compound having the formula:
1
from a compound having the formula:
2
wherein R
1
is hydrogen, fluorine, chlorine or SiR
5
R
6
R
7
, wherein R
5
, R
6
, and R
7
are independently the same or different an alkyl group or an aryl group, R
2
is an alkyl group, R
3
is a protecting group, R
4
is an alkyl group, an allyl group, a propargyl group —CO
2
H, or a benzyl group, R
8
is —CO
2
R
10
, wherein R
10
is an alkyl group or an aryl group, X
1
is OH and X
2
is H, includes the step of exposing compound (III) to at least one of an organic acid or an inorganic acid. A compound has the general formula (III).
一种合成具有以下化学式的化合物的方法:1从具有以下化学式的化合物中进行:2其中R1为氢、氟、氯或SiR5R6R7,其中R5、R6和R7分别独立地为相同或不同的烷基基团或芳基基团,R2为烷基基团,R3为保护基团,R4为烷基基团、烯丙基团、丙炔基团、—CO2H或苄基团,R8为—CO2R10,其中R10为烷基基团或芳基基团,X1为OH,X2为H,包括将化合物(III)暴露于至少一种有机酸或无机酸中的步骤。化合物具有一般化学式(III)。